Piezoelectric motor
0.2 - 0.8 N, 2.4 - 30 V | X15G
Elliptec
A microcontroller and two tiny transistors are all that is needed to supply the piezoelectric ceramics with a sufficient voltage to make the ceramics expand by less than one micrometer, and to let it contract again when the voltage is cut off. During motor operation, this process occurs about 100’000 times per second.
The geometry of the resonator enhances the vibration of the piezoelectric ceramic and translates it into elliptical motion at the motor tip.
A spring maintains a steady force between the resonator tip (aka the stator) and a driven element (aka the rotor), which in turn moves by up to a few micrometers with every oscillation of the piezo. Because this process occurs at ultrasonic frequencies, the motion of the driven element is continuous and smooth.
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